KR101172843B1 - Apparatus for inspecting connection of digital image display device DVI connector - Google Patents

Abstract

The apparatus for detecting the connection of a DVI connector of the digital image display device of the present invention includes: a connection signal generator for distributing a voltage so as to have a threshold voltage or more with respect to the voltage when a predetermined voltage is applied from a video card connected to the connector; And a connection signal detector for determining that the connector is connected to the video display device when the voltage is higher than the voltage, and outputting image display recognition information indicating information on the video display device to the video card through the connector.

DVI, Digital Video Display, Connector, Cable, Connection, MCU

Description

Apparatus for inspecting connection of digital image display device DVI connector}

1A, 1B, and 1C are views schematically illustrating a pinout structure of a DVI-D type connector and a DVI-I type connector, and a connection part of a digital imaging apparatus to which these connectors are connected;

2 is a diagram illustrating an example of detecting whether a DVI connector is connected to a conventional digital video display device;

3 is a view showing a preferred embodiment of the device for detecting the DVI connector of the digital image display device according to the present invention.

The present invention relates to a device for detecting whether a DVI (Digital Video Interface) connector of a digital video display device is connected. More specifically, a digital image of which a DVI cable connected to a video card of a system is inputted with DVI. When connected to a monitor, which is a display device, the monitor is connected to a DVI connector of a digital video display device that can more accurately determine that the DVI cable is connected without being affected by the video card.

In general, analog image display devices using a cathode-ray tube (CRT) and digital image display devices using a liquid crystal display (LCD) are widely used in desktop computers and portable computers.

The digital image display device receives an analog image signal or a digital image signal from a signal source (eg, a graphics card of a computer main body) and displays the same on a screen.

The DDWG (Digital Display Working Group) has announced the DVI (Digital Video Interface) standard, which defines DVI-D as a signal source that only supports digital video signals, and DVI-D when both digital and analog video signals are supported. It was defined as I.

1A, 1B, and 1C are diagrams schematically illustrating a pinout structure of a DVI-D type connector and a DVI-I type connector, and a connection portion of a digital imaging apparatus to which these connectors are connected.

As shown, when the signal source only supports digital signals, the signal source is connected to the signal source via a DVI-D signal cable having a connector as shown in FIG. 1A and a digital image display device as shown in FIG. 1C. Connect it.

In addition, when the signal source supports both digital and analog signals, the signal source is connected to the digital image display device as shown in FIG. 1C through a DVI-I signal cable having a connector as shown in FIG. 1B.

2 is a diagram illustrating an example of detecting whether a DVI connector is connected in a conventional digital video display device.

In the figure, an example is shown in which a DVI cable 40 connected to a DVI VIDEO CARD 10 of a system (the present invention describes a computer as an example) is connected to a monitor 50 which is a digital video display device. .

The computer outputs 5 volt (V) power to the monitor 50 connected to the DVI cable 40 through pin 14 of the DVI video card 10. The monitor 50 is connected to the DVI video of the computer by a voltage of 2.5V or higher (recognized as HIGH) that is induced from the 5V power input from the 14 pin of the DVI video card 10 of the computer past the PULL DOWN resistor. The pin 10 is provided as a hot plug detection pin (HOT PLUG DETECT PIN) provided on the card 10.

The computer recognizes that pin 16, the hot plug detection pin of the DVI video card 10, from which the voltage provided from the monitor 50 is received, is HIGH. At this time, the computer transmits EDID (Extended Display Identification Data) information (digital EDID information in the present invention) for recognizing the video display device stored in the EEPROM provided in the monitor 50. Read through the pin. When the digital EDID information is read correctly, the computer outputs the digital video signal to the monitor 50.

When the monitor 50 uses a DVI-I type connector, the monitor 50 selectively transmits analog EDID information and digital EDID information to a DVI video card 10 of a computer through one Display Data Channel (DDC). Should be. Accordingly, the monitor 50 determines what kind of cable is currently connected, and if the analog cable is connected, the analog EDID information, if the DVI cable 40 is connected, the digital EDID information, the DVI of the computer Provided by video card 10.

At this time, the computer detects the voltage of the hot plug detection pin, which is pin 16 of the DVI video card 10 to which the DVI cable 40 is connected, and determines that the DVI cable 40 is connected. In this case, the internal impedance of the hot plug detection pin of the DVI video card 10 may vary according to the video card manufacturer, and the internal impedance of the video card may be low. In this case, the MCU (Micro Controller Unit) 60 of the monitor 50 does not determine that the DVI cable 40 is connected when the voltage of pin 28, the DVI cable detection terminal, drops below the voltage recognized as high. can not do it. Accordingly, the MCU 60 does not provide the digital EDID data to the DVI video card 10, and the computer may not output the digital video signal to the monitor 50 through the DVI video card 10.

Looking at such a conventional problem in more detail as follows.

When the DVI video card 10 and the monitor 50 are connected through the DVI cable 40, the computer outputs + 5V to the pin 14 of the DVI video card 10. The monitor (50) inputs + 5V input to pin 14 to the voltage through the RM52 10KΩ resistor, and the DVI video card (16) of the computer through the hot plug detection pin, DVI-I MNT pin 16, of the monitor 50. Supply pins.

The monitor's MCU (60) also recognizes that the DVI cable (40) is connected by recognizing the voltage across the RM52 10KΩ resistor, and loads the digital EDID information from the EEPROM, ready to be provided by the computer upon request of the EDID information. Do

When the level of the hot plug detection pin input to the DVI video card 10 is recognized as high, the computer reads the EDID information and reads the digital EDID information from the monitor 50 to output the digital video signal. .

However, the voltage applied to the DVI DETECT PIN (MCU # 28), which is the DVI cable connection detection pin of the monitor 50, that is, the DVI detection voltage is applied with the induced voltage by Equation 1 below.

DVI detection voltage = 5 * {Zvideo_card / (Zvideo_card + RM52)}

Therefore, when the internal impedance of the hot plug detection pin of the DVI video card 10 of the computer is low, the voltage induced in the DVI DETECT PIN (# 28) of the MCU 60 is low. In addition, when the voltage drops below 2.5V, which is recognized as high by the MCU 60, the MCU 60 may not determine whether to connect the DVI cable 40 connected to the DVI video card 10. In this case, there is a problem in that the computer cannot load the digital EDID information from the monitor 500 and the digital video cannot be read from the DVI video card 10 of the computer and the digital signal cannot be output to the monitor 50.

An object of the present invention for solving the above problems, when the DVI cable connected to the DVI video card of the computer from the MCU of the monitor is connected to the monitor, the DVI cable is connected to the monitor whether DVI cable according to the video card manufacturer The present invention provides a device for detecting the presence of a DVI connector of a digital image display device that can more accurately discriminate without changing a voltage for discrimination.

According to an embodiment of the present invention, in the apparatus for detecting whether a connector of a video display device is connected, when a predetermined voltage is applied from a video card connected to the connector, a voltage distribution is provided so as to have a threshold voltage or more with respect to the voltage. If the signal generator and the voltage-divided voltage is greater than or equal to the threshold voltage, it is determined that the connector is connected to the video display device, and image display recognition information indicating information about the video display device is transmitted to the video card through the connector. It is achieved by a connector connection detection device including a connection signal detector for outputting.

Preferably, the connection signal generator has a first resistance value, has a first resistance portion disposed in series with respect to the applied voltage, and a second resistance value greater than the first resistance value. And a second resistor disposed in parallel with the first resistor. In this case, the applied predetermined voltage is divided by the first and second resistor units.

The predetermined voltage applied is 5V and the threshold voltage is 2.5V. In addition, the first resistance value is 1 ~ 5kΩ, the second resistance value is 10kΩ. Accordingly, the voltage divided by the connection signal generation unit and input to the connection signal detection unit is 2.5 to 2.5 calculated by “5V * {second resistance value / (second resistance value + first resistance value)}”. 5V.

On the other hand, the video card is a DVI (Digital Visual Interface) video card, the connection signal detection unit is a MCU (Micro Controller Unit), the connector is a DVI (Digital Visual Interface) cable. In addition, the image display recognition information is digital EDID (Extended Display Identification Data) information.

According to the present invention, when a DVI cable connected to a DVI video card of a computer is connected to a monitor, the voltage output from the resistance distribution circuit is provided with a resistance distribution circuit for dividing a predetermined voltage input from the computer to a reference voltage or higher. The voltage of this applied pin allows the monitor's MCU to determine the DVI cable connection, eliminating the fluctuation of the DVI cable connection detection voltage according to the video card manufacturer, and accurately detecting the state of the DVI cable connection.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

The present invention adds resistors RM53 and RM54 to the output terminals of resistors RM52 as divider resistors so that the output voltage of the resistors RM52 does not affect the DVI video card of the computer when determining whether the DVI cable is connected to the monitor. V) We propose a device that detects higher and can more accurately determine whether a DVI cable is connected.

3 is a view showing a preferred embodiment of the device for detecting the DVI connector of the digital image display device according to the present invention.

As shown, the DVI connector connection detection device has a connection signal generator 700 and the MCU 600 for detecting the connection signal.

When the 5V voltage applied to the DVI video card 100 is output to the input port of the monitor 500 connected through the DVI cable 400, the connection signal generator 700 receives the input 5V voltage as a reference voltage (2.5). The voltage is divided so as to have a voltage equal to or greater than V) and output to pin 28 of the MCU 600.

The connection signal generator 700 has a distribution resistor RM53 (first resistor) and RM54 (second resistor) for voltage distribution of the voltage 5V provided from the DVI video card 100. Resistor RM53 and RM54 are arranged in parallel, resistor RM53 is set to 4.7 kΩ (first resistance value) and RM54 is set to 10 kΩ (second resistance value).

Therefore, when a DVI cable connected to the DVI video card of the computer is connected to the monitor, a pin is provided to which the voltage output from the resistance distribution circuit is applied by including a resistance distribution circuit for voltage division of a predetermined voltage input from the computer to a reference voltage or higher. The monitor's MCU determines the DVI cable's connection using the voltage, so that the DVI cable connection detection voltage according to the video card manufacturer can be eliminated and the DVI cable is correctly detected.

Looking at the DVI connector connection detection example using the DVI connector connection detection device of the video display device of the present invention having the above characteristics in more detail as follows.

When the DVI video card 100 and the monitor 500 are connected through the DVI cable 400, the computer outputs + 5V to pin 14 of the DVI video card 100. The monitor 500 divides the + 5V input to the pin 14 through the RM53 4.7kΩ (first resistance value) and RM54 10kΩ (second resistance value) resistors of the connection signal generator 700 and then divides the MCU (600). Is applied to pin 28 of DVI detection pin. In this case, the voltage is divided and the voltage (DVI detection voltage) applied to pin 28 of the MCU 600 which is a DVI detection pin has a voltage as shown in Equation 2 below.

DVI detection voltage = 5V * {second resistance value / (second resistance value + first resistance value)}

= 5V * {10kΩ / (10kΩ + 4.7kΩ)} = 3.4 [V]

Therefore, when the DVI cable 400 is connected to the monitor, the MCU 600 of the monitor 500 is connected to the DVI signal because the reference voltage of 2.5 V or higher, which the MCU 600 recognizes as high on the DVI detection pin, is always applied to the MCU. It is determined that the cable 400 is connected to the monitor and provides the digital EDID information to the DVI video card 100 at the request of the computer.

Accordingly, when the level of the hot plug detection pin input to the DVI video card 100 is recognized as high, the computer performs reading of the EDID information and reads the digital EDID information from the monitor 500 to monitor the digital video signal. 500).

In the foregoing, certain preferred embodiments of the present invention have been shown and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention attached to the claims. will be.

According to the present invention, when a DVI cable connected to a DVI video card of a computer is connected to a monitor, a resistance divider circuit for distributing a predetermined voltage input from the computer to a reference voltage or higher is output from the resistor divider circuit. The monitor's MCU determines the DVI cable connection through the voltage applied to the pin, eliminating the fluctuation of the DVI cable connection detection voltage according to the video card manufacturer, and accurately detecting the state of the DVI cable connection.

Claims (10)

In the device for detecting the connection of the DVI connector of the digital video display device, A connection signal generator configured to divide the voltage so that a predetermined voltage is applied to the voltage when the predetermined voltage is applied from the video card connected to the connector; And A connection signal for determining that the connector is connected to the video display device if the voltage-divided voltage is greater than or equal to the threshold voltage, and outputting image display recognition information indicating information about the video display device to the video card through the connector. Including a detector, The connection signal generator includes a first resistor unit having a first resistance value and disposed in series with respect to the applied voltage, and in parallel with the first resistor unit having a second resistance value greater than the first resistor value. A second resistor disposed thereon, And the predetermined voltage is divided by the first and second resistors to connect the DVI connector of the digital image display device. delete The method of claim 1, And a predetermined voltage applied thereto is connected to a DVI connector of the digital video display device. The method of claim 3, The threshold voltage is 2.5 ~ 5V characterized in that the DVI connector connection device detection device of the digital video display device. 5. The method of claim 4, And a first resistance value of 4.7 kΩ. 6. The method of claim 5, The second resistance value is 10kΩ, characterized in that the DVI connector connection device detection device of the digital video display device. The method according to claim 6, The voltage divided by the connection signal generator and input to the connection signal detector is 3.4V calculated by "5V * {second resistance value / (second resistance value + first resistance value)}". Device for detecting DVI connector of digital video display device. The method according to any one of claims 1 and 3 to 7, And the video card is a DVI (Digital Visual Interface) video card. 9. The method of claim 8, The connection signal detecting unit is connected to the DVI connector of the digital video display device, characterized in that the MCU (Micro Controller Unit). 10. The method of claim 9, The image display recognition information is connected to the DVI connector of the digital image display device, characterized in that the digital EDID (Extended Display Identification Data) information.

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